JPS5935602Y2 - Asphalt regeneration furnace - Google Patents

Description

[Detailed description of the invention] This invention is based on the idea that asphalt waste excavated during asphalt-paved road repair work is passed through a rotating cylindrical retort, heated and pulverized. Regarding asphalt regeneration furnaces, which use a cylindrical sieve to separate and collect reusable asphalt powder from unpulverized asphalt lumps and foreign substances such as stones, the sieve is particularly susceptible to clogging due to asphalt adhering to the sieve. This invention relates to an asphalt regeneration furnace that prevents the occurrence of.

In an asphalt regeneration furnace that has a cylindrical retort installed inside the furnace body and a cylindrical sieve connected to the discharge end, it is necessary to install a collection chute below the sieve, so a burner is installed directly below the sieve. cannot be established, and
Since the sieve is usually located in the corner of the furnace body,
The temperature of the sieve itself is lower than that of the asphalt that is heated, and therefore, it is inevitable that the asphalt that has been softened by heating will adhere to the sieve and harden, causing clogging, and that operation must be periodically interrupted. It was necessary to clean the sieves, which was a major cause of lower operating efficiency.

The object of the present invention is to eliminate such drawbacks of the conventional asphalt regeneration furnace and to provide an asphalt regeneration furnace that can be operated continuously for a long time without clogging the sieve.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a furnace body constructed of refractories and having a rectangular cross section and long in the front-rear direction. Several fireboxes 12 are provided at the bottom of the furnace chamber 11, excluding the front end. A burner 13 is installed inside the furnace, and fuel injected from the burner 13 is combusted in the firebox 12 to maintain the inside of the furnace chamber 11 at a high temperature.

Reference numeral 2 denotes a cylindrical retort, which is installed in the furnace body 1 with a downward slope in the front, and whose rear end passes through a circular hole 14 formed in the rear wall of the furnace body 1 to the outside of the furnace body 1. A ring 21.21 protruding from the outer circumference of both the front and rear ends is rotatably supported by rollers 22, 22 provided inside and outside the furnace body 1, and a gear 23 fixed to the outer circumference of the rear end. A pinion of a motor (not shown) is engaged with the motor, and the motor rotates in one direction.

A cylindrical sieve 3 with a large number of sieve openings 31 is integrally formed at the front end of the retort 2, and a collection chute 32 is provided below the sieve 3 to collect asphalt powder A1 that has passed through the sieving openings 31. On the front surface of the furnace body 1, a discharge chute 33 is formed on the furnace wall to discharge unpulverized asphalt chunks A2 or foreign substances such as stones that have not passed through the sieve openings 31 out of the furnace body 1 from the open end of the sieve 3. It is installed through a window hole 15.

At the rear end of the retort 2, a hopper 4 and a supply pipe 41 for supplying the large chunks of asphalt waste A put into the hopper 4 are provided. The furnace chamber 11 is discharged from the exhaust hole 16 formed in the center of the side wall.
A blower 5 is installed to discharge the combustion gas inside the retort 2, branch pipes 52 and 53 are branched from the exhaust pipe 51, and the combustion gas flowing into the rear branch pipe 52 is recirculated into the retort 2.
The combustion gas flowing into the front branch pipe 53 is sent from the front wall of the furnace body 1 through the sieve 3 into the retort 2, increasing its internal temperature and keeping it in a reducing atmosphere to prevent oxidation of the heated material. It looks like this.

Further, the amount of combustion gas flowing into each branch pipe 52, 53 is adjusted by the opening degree of the damper 54, 55, 56.

The above is the same as a conventionally known asphalt regeneration furnace,
The lumpy asphalt waste material A put into the hopper 4 is heated and softened while being stirred by the rotation of the retort 2 and transferred forward, collides with each other due to gravity fall, and is gradually crushed, and is connected to the front end. In the sieve 3, the reusable asphalt powder A1 is separated from unpulverized asphalt lumps A2 and foreign substances such as stones and recovered.As mentioned above, the sieve 3 is connected to the front end of the retort 2. It is located in the corner of the furnace chamber 11 and is further away from the firebox 12 due to the collection chute 32 provided below, so the temperature is lower than that of the retort 2, and the softened asphalt When the powder A1 adheres, the temperature decreases and hardens, causing the sieve mesh 31 to become clogged.

Therefore, in this embodiment, the inner and outer surfaces of the upper part of the sieve 3 are covered with arc-shaped covers 61 and 62, and the covers 61 and 62 on both sides are covered with plates 61 and 62 facing the open end of the sieve 3.
3, the arc-shaped ends of each cover 61 and 62 and the end on the retort 2 side are respectively bent inward to minimize the gap S between the inner and outer surfaces of the retort 2, and the furnace body 1 A blower pipe 64 penetrating through the ceiling of the furnace is connected to a cover 62 of the H-rule. A part of the high temperature combustion gas in the center of the cover 61
, 62.

In addition, as shown in FIG. 2, the covers 61 and 62 are not located directly above the sieve 3, but are tilted in the direction of rotation of the sieve 3, so that the asphalt waste material A that is stirred by the rotation of the sieve 3 does not collide. It is installed in the same position.

In addition, in order to adjust the flow rate of the blower pipe 64, the branch pipe 53 on the front side is
Another damper 66 is provided ahead of the branch point.

Therefore, the sieve 3 is heated by the high-temperature combustion gas in the center of the furnace chamber 11 that is sent into the covers 61 and 62, and this combustion gas is blocked by the inner cover 61 and the asphalt waste in the sieve 3 is heated. Since the asphalt waste material A is not blown onto the sieve 3 and is discharged backward through the upper part of the retort 2 through a small gap S, the sieve 3 is kept at a higher temperature than the asphalt waste material A fed into the sieve 3.

Therefore, even if the asphalt waste material A comes into contact with the sieve 3, it will not harden and adhere, and no clogging will occur.

As specifically explained in the above embodiment, the asphalt regeneration furnace of the present invention has a cylindrical retort installed almost horizontally in the furnace body, and asphalt waste material introduced from one end of the retort is transferred to other parts by rotation of the retort. The reusable asphalt powder is heated and pulverized while being transferred to the other end of the retort, and is dropped through the sieve openings formed on the circumferential surface of a cylindrical sieve that is integrally connected to the other end of the retort. In an asphalt regeneration furnace that separates and collects foreign substances such as asphalt lumps and stones, the inner and outer peripheries of at least the upper part of the sieve are covered with a substantially arc-shaped cover, and the inner space of the cover is used to cover the inside of the furnace body. The gist is that the sieve is heated by the combustion gas by connecting it to a combustion gas exhaust pipe, and the combustion gas sent to the sieve is blocked by a cover and is not blown onto the asphalt waste. First, since only the sieve is heated to a high temperature, the softened asphalt does not harden and adhere to the sieve, effectively preventing clogging and allowing continuous operation for a long time.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, and FIG. 2 is an enlarged sectional view taken along the line X--X of FIG. 1. 1: Furnace body, 2: Retort, 3: Sieve, 51:! Burning gas exhaust pipe, 61°62: Cover.

Claims (1)

[Scope of utility model registration request] A cylindrical retort is installed almost horizontally in the furnace body, and asphalt waste material introduced from one end of the retort is transferred to the other end by rotation of the retort while being heated and pulverized, and reusable asphalt powder is transferred to the other end of the retort. In the asphalt regeneration furnace, which separates and collects unpulverized asphalt lumps and foreign substances such as stones by dropping the asphalt through the sieve holes formed on the circumferential surface of a cylindrical sieve that is integrally connected to the end. The inner and outer circumferences of at least the upper part of the sieve are covered with a substantially arc-shaped cover, and the inner space of the cover is connected to a combustion gas exhaust pipe in the furnace body, and the sieve is heated by the combustion gas. An asphalt regeneration furnace characterized by the following.